When a player sees a team-mate out of the corner of his eye, the player is using his peripheral vision.
Lots of plays, which happen in cricket, rugby or soccer, do not happen directly in front of the player, thus it's important for the player to train and improve the ability to see action to the side without having to turn the head.
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Try watching TV with your head turned to one side and when watching a live game, you can turn your head to one side and see if you can still follow the action.
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